1 gh-ost --user=root  \ 2 --password=root \ 3 --host=5.5.5.101 \ 4 --port=3306 \ 5 --database=lxddb \ 6 --table=t123 \ 7 --alter=" add column age int(10) NOT NULL DEFAULT '18' COMMENT '年龄',add index idx_t123_age(age)" \ 8 --allow-on-master  \ 9 --assume-rbr  \10 --initially-drop-old-table \11 --initially-drop-ghost-table \12 --ok-to-drop-table \13 --cut-over-lock-timeout-seconds=10 \14 --serve-socket-file /tmp/test-gh-ost.sock \15 --replica-server-id 88888 --execute